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§ 52.2321 Classification of regions.
The Utah plan was evaluated on the basis of the following classifications:
Air quality control region | Pollutant | ||||
---|---|---|---|---|---|
Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Photochemical oxidants (hydrocarbons) | |
Wasatch Front Intrastate | I | I | I | I | I |
Four Corners Interstate | IA | IA | III | III | III |
Utah Intrastate | III | III | III | III | III |
[37 FR 10898, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]